Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 430 | 389 | 427 | 419 | 429 | 429 |
| Tmin | 154 | 141 | 149 | 144 | 152 | 157 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 97 | 89 | 100 | 99 | 100 | 108 |
| Humidity/Visibility | 58 | 52 | 57 | 56 | 57 | 68 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 452 | 457 | 442 | 450 | 440 | 457 |
| Tmin | 178 | 179 | 174 | 173 | 168 | 177 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 132 | 130 | 125 | 121 | 131 | 135 |
| Humidity/Visibility | 81 | 86 | 83 | 79 | 78 | 84 |
Climate data is usually derived from meteorological data of a certain number of years. The actual number of recorded years may vary from only a couple to 50 years or more. The quality of climate data depends on the number of available recorded years. Fewer years means less reliable data. The standart-period for reliable climate data is 30 years. For example, the mean monthly temperature for, let's say January, would ideally calculated from a total number of 930 recorded January-days. However, the usual number of recorded days is much smaller. The table above shows the actual number of recorded days for every parameter measured. |
